if your card is rented regularly, you never pay the 1 dec. again. after every rental, the time period to cancel is extended by another 30 days. if someone rents your card on the 29th day. it stays on the market for 30 days longer again. so you only sort out the cards that are not rented anyway. it also has advantages for us. so we have cards that no one rents anyway directly to hand and do not have to cancel the rentals first. because we see so which cards. are rented and which is moldy there for years^^